Iphone 5s
hello, wanted to ask for some help, I'm about to buy an iphone 5s and my doubt is this, I live in Usa 6 months and 6 months in Brazil, researching I learned that apple has released several models with different signal frequencies and that the Brazil seems that will not serve as the Usa, I always buy iphone's unlocked because when I go from one country to another only change the chip, I wonder if I can buy here in Usa any model I can use 4g in Brazil too.
iPhone 5s, iOS 7